only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/TypedData/TypedDataManager.php
+++ b/core/lib/Drupal/Core/TypedData/TypedDataManager.php
@@ -168,9 +168,12 @@ public function getPropertyInstance(TypedDataInterface $object, $property_name,
       // a shorter string than the serialized form, so array access is faster.
       $parts[] = json_encode($settings);
     }
-    // Property path for the requested data object. When creating a list item,
-    // use 0 in the key as all items look the same.
-    $parts[] = $object->getPropertyPath() . '.' . (is_numeric($property_name) ? 0 : $property_name);
+    // Property path for the requested data object.
+    // the original code is:
+    // code$parts[] = $object->getPropertyPath() . '.' . (is_numeric($property_name) ? 0 : $property_name);
+    // When creating a list item , use 0 in the key as all items look the same.
+    // But wen Map data use setPropertyDefinition, We may pass an array that has numerical key with different type of value
+    $parts[] = $object->getPropertyPath() . '.' . $property_name;
     $key = implode(':', $parts);
 
     // Create the prototype if needed.